Temperature-independent relative humidity sensing properties of polymer micro-bottle resonators coated with graphene oxide

Hou Chang Li, Mengyu Wang, Bin Liu*, Juan Liu, Qi Wang, Xing-Dao He, Hau Ping Chan, Danling Wang, Jinhui Yuan, Qiang Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A polymer-based micro-bottle resonator coated with graphene oxide (GO) film is presented to improve the relative humidity (RH) sensing performance. Polymeric material Loctite 3525 was coated onto a quartz fiber and cured by using UV light irradiation and thermal reflow technology. A layer of GO film was prepared on the micro-bottle resonator by the dip impregnation method, which realized a high Q-factor (>104) transmission of energy by appropriately designing a wave-guide resonator coupling. By optimizing the concentration of GO dip impregnation solution, high sensitivity and figure of merit (FoM) of 0.161 nm/%RH and 2.01/%RH were achieved in the RH range of 22–81%. In addition, after high-temperature annealing at 300 °C, the temperature sensitivity decreased by an order of magnitude from 0.793 nm/°C to 0.068 nm/°C, which significantly reduces the cross-sensitivity between humidity and temperature. The proposed resonator has the advantages of being compact in size, low in cost, high sensitivity, and low in temperature crosstalk.
Original languageEnglish
Article number111199
Number of pages8
JournalMeasurement
Volume196
Early online date26 Apr 2022
DOIs
Publication statusE-pub ahead of print - 26 Apr 2022

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